Controlling mechanism for punch-presses and like machinery.



N. NELSON. CONTROLLING MECHANISM FOR PUNCH PRESSES AND LIKE MACHINERY.

APPLICATION FILED AUG. 24, 1910. 1,030,009.

Patented June 18, 1912.

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N N. NELSON, CONTROLLING MBOHANISM FOR PUNCH PRESSES AND LIKE MACHINERY.

APPLICATION FILED AUG. 24, 1910.

1,030,009, Patented June 18, 1912.

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6. (5 M. Mia 1212i JWZ/fl/L, CR (Qww NATHANIEL NELSON, OF CHICAGO, ILLINOIS.

Specification of Letters Patent.

Patented June 18, 1912.

Application filed August 24, 1910. Serial No. 578,697.

To all whom it may concern:

Be it known that I, NATHANIEL NELsoN, a citizen of the United States, and a resident of the city of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Controlling Mechanism for Punch-Presses and Like Machinery, of which the following is a specification.

My invention relates to punch presses and more specifically to improvements in controlling mechanism therefor for effecting the intermittent operation thereof.

The object of my invention is the provision of a cont-rolling mechanism of the character mentioned whereby, when in operation, the intervals of operation and inertness of the press mechanism cooperating therewith will be of such proportionate duration as to afford adequate time between successive periods of operation of the punching mechanism for the removal of work from under the punch and for the positioning of new work thereunder.

A further object is the provision of a controlling mechanism as mentioned which will be of durable and economical construction and eflicient in operation.

Other objects will appear hereinafter.

With these objects in view my invention consists in a controlling mechanism for punch presses characterized as above mentioned and in certain details of construction and arrangement of parts all as will be hereinafter fully described and more particularly pointed out in the appended claim.

My invention will be more readily under stood by reference to the accompanying drawings forming a part of this specification, and in which,

Figure 1 is a fragmentary side elevation of a punch press equipped with a controlling mechanism embodying the preferred form of my invention, Fig. 2 is a sectional elevation illustrating the controlling mechanism more in detail, and Fig. 3 is a section taken on substantially line wc of Fig. 2.

Referring now to the drawings, 1 indicates the frame of the punch press in which is rotatably mounted the shaft 2, the latter being so connected to the punching mechanism (not shown) of the press, that the rotation thereof effects operation of said mechanism. Mounted upon the outer extremity of the shaft 2, is a loose pulley 3,

the latter being held against longitudinal movement thereon by means of collars 4 and 5, the former of said collars being pinned to said shaft and the latter fixed thereto by means of a set screw 6. The pulley 3, when the punch press is in operation, is constantly the shaft 2 is a longitudinally extending groove 13 of semi-circular cross section. Rockingly mounted in said groove is an elongated key 147, the same being held in po sition in said groove by the collars 4 and 5 which are provided with semi-circular grooves 15 which register with the channel 13 in the shaft 2 forming circular bearings for the cylindrical extremities of said key. Formed in the bearing surface of the pulley 3 at diametrically opposite points therein are longitudinally extending grooves 16 semi-circular in cross section, which are adapted to register with the grooves 13 in the shaft 2. The key 14 is adapted through the medium of a depending stem 17 to be rocked to effect the engagement thereof with one or the other of said grooves 16 in order to establish operative connection between the pulley 3andthe shaft 2. A compression spring 18 interposed between the free end of the stem 17 and a lug 19 formed upon the adjacent side of the collar 1 tends to normally hold the key let in operative position against a stop pin 20 secured in and projecting from said collar, as clearly shown in Fig. 3.

Rigidly secured upon the side of the frame 1 below the shaft 2 is a bracket 21. Rotatably mounted in said bracket is a shaft 22. Fixed to said shaft at theouter end thereof is a sprocket wheel 23 arranged substantially coplanar with the sprocket wheel 12, said wheels 12 and 23 being of relative diameters preferably as 2 is to 3. Traveling around the sprocket wheels 12 and 23 is a sprocket chain 24. Secured for pivotal adjustment at 25 to the bracket 21 is an arm 26 carrying a sprocket pinion 27 at its outer extremity engaging the chain 24, said arm and pinion serving, as will be readily understood, as a tightener for said chain. Pinned or otherwise secured to the opposite extremity of shaft 22 is a cam 28.

33 indicates a rod which is mounted for vertical reciprocation in the bracket 21. The upper extremity of said rod is pivotally connected to the other arm of the member 30. A pivotal point 341 is provided in said rod, being provided for obvious reasons. Mounted upon said rod adjacent itsv lower extremity is a roller 35 adapted for engagement by the periphery of the cam 28, the latter, as shown in Fig. 3, being of such peripheral form as to be adapted, when rotated, to effect intermittent sudden depression of the rod 33 and hence corresponding rocking actuation of the member 30. By means of a switch fork 36 rockingly mounted upon a bracket 37 and engaged at its rearward end is a channel switch block fixed to the shaft 22, the latter may evidently he slid if desired in its bearings toeffect complete disengagement of the cam 28 from the roller 35.

By the arrangement disclosed it will be seen that in operation and with the shaft 22 in operative position, the member 30 will be intermittently rocked by the cam 28 to effect the operative and inoperative positioning thereof relative to the stem 17 of the key 14L, said key, as above mentioned being normally held in position for engagement with the grooves 16 of the pulley 3. The arrangement is such that the key 14L will be rocked into and out of engagement with the channel 16 at such intervals that the shaft 2 will be operating during substantially two periods of time and inert during one, thus allowing sufiicient time between the intervals of operation of the punch mechanism to permit of the removal of work from under the same and for the arrangement of other work in the place of that rei moved.

The construction set forth isd'urable and economical, the same is so designed as to not be susceptible to readily becoming inoperative, and the same is of great efliciency in operation.

VVhile I have shown. what I deem to be the preferable form of my controlling mechanism, I do not wish. to be limited In a controlling mechanism for puneh' presses and the like, a bell crank lever having one arm arranged to engage a depending portion of a rock pin clutch, a rod pivoted to the other arm thereof, a knuckle hinge in said rod, the lower portion of said rod being mounted in a frame for vertical reciprocation, a friction roller on said rod, a shaft mounted in said frame for horizontal reciprocation, a cam on said shaft arranged b to be moved into and out of engagement with said roller, substantially as described.

In testimony whereof I have signed my name to this specification in: the presence of two subscribing witnesses.

NATHANIEL NELSON.

Witnesses W'. C. SMITH, JosnUA R. H. Por'rs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

